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source: trunk/sources/HeuristicLab.IntVector/IntVectorCrossoverBase.cs @ 1385

Last change on this file since 1385 was 1218, checked in by swagner, 16 years ago

Refactoring of crossover operators (#470)

File size: 3.2 KB
Line 
1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2008 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
4 *
5 * This file is part of HeuristicLab.
6 *
7 * HeuristicLab is free software: you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation, either version 3 of the License, or
10 * (at your option) any later version.
11 *
12 * HeuristicLab is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
19 */
20#endregion
21
22using System;
23using System.Collections.Generic;
24using System.Text;
25using HeuristicLab.Core;
26using HeuristicLab.Data;
27using HeuristicLab.Evolutionary;
28
29namespace HeuristicLab.IntVector {
30  /// <summary>
31  /// Base class for all integer vector crossover operators.
32  /// </summary>
33  public abstract class IntVectorCrossoverBase : CrossoverBase {
34    /// <summary>
35    /// Initializes a new instance of <see cref="IntVectorCrossoverBase"/> with one variable info
36    /// (<c>IntVector</c>).
37    /// </summary>
38    public IntVectorCrossoverBase()
39      : base() {
40      AddVariableInfo(new VariableInfo("IntVector", "Parent and child integer vector", typeof(IntArrayData), VariableKind.In | VariableKind.New));
41    }
42
43    /// <summary>
44    /// Performs a crossover by calling <see cref="Cross(HeuristicLab.Core.IScope, HeuristicLab.Core.IRandom, int[][]"/>
45    /// and adds the created integer vector to the current scope.
46    /// </summary>
47    /// <exception cref="InvalidOperationException">Thrown if the parents have different lengths.</exception>
48    /// <param name="scope">The current scope which represents a new child.</param>
49    /// <param name="random">A random number generator.</param>
50    protected sealed override void Cross(IScope scope, IRandom random) {
51      int[][] parents = new int[scope.SubScopes.Count][];
52      int length = -1;
53      for (int i = 0; i < scope.SubScopes.Count; i++) {
54        parents[i] = scope.SubScopes[i].GetVariableValue<IntArrayData>("IntVector", false).Data;
55        if (i == 0) length = parents[i].Length;
56        else if (parents[i].Length != length) throw new InvalidOperationException("ERROR in IntVectorCrossoverBase: Cannot apply crossover to integer vectors of different length");
57      }
58
59      int[] result = Cross(scope, random, parents);
60      scope.AddVariable(new Variable(scope.TranslateName("IntVector"), new IntArrayData(result)));
61    }
62
63    /// <summary>
64    /// Performs a crossover of multiple integer vectors.
65    /// </summary>
66    /// <param name="scope">The current scope.</param>
67    /// <param name="random">A random number generator.</param>
68    /// <param name="parents">An array containing all parent integer vectors.</param>
69    /// <returns>The newly created integer vector, resulting from the crossover operation.</returns>
70    protected abstract int[] Cross(IScope scope, IRandom random, int[][] parents);
71  }
72}
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